Genesis 3:14-15

14And Jehovah Elohim said to the serpent, Because thou hast done this, be thou cursed above all cattle, and above every beast of the field. On thy belly shalt thou go, and eat dust all the days of thy life.

15And I will put enmity between thee and the woman, and between thy seed and her seed; he shall crush thy head, and thou shalt crush his heel.